package com.jinhuhang.u2.util;


import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.security.InvalidKeyException;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import java.util.ArrayList;
import java.util.List;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;


public class RSAEncryptor {
	 public RSAEncryptor(String publicKey, String privateKey) throws Exception {
	   
	        loadPublicKey(privateKey);  
	        loadPrivateKey(publicKey);  
	    }
	    public RSAEncryptor() {
	        // load the PublicKey and PrivateKey manually
	    }


	    public String getKeyFromFile(String filePath) throws Exception {
	        BufferedReader bufferedReader = new BufferedReader(new FileReader(filePath));

	        String line = null;
	        List<String> list = new ArrayList<String>();
	        while ((line = bufferedReader.readLine()) != null){
	            list.add(line);
	        }

	        // remove the firt line and last line
	        StringBuilder stringBuilder = new StringBuilder();
	        for (int i = 1; i < list.size() - 1; i++) {
	            stringBuilder.append(list.get(i)).append("\r");
	        }

	        String key = stringBuilder.toString();
	        return key;
	    }

	    public String decryptWithBase64(String base64String) throws Exception {
	        //  http://commons.apache.org/proper/commons-codec/ : org.apache.commons.codec.binary.Base64
	        // sun.misc.BASE64Decoder
	        byte[] binaryData = decrypt(getPrivateKey(), new BASE64Decoder().decodeBuffer(base64String) /*org.apache.commons.codec.binary.Base64.decodeBase64(base46String.getBytes())*/);
	        String string = new String(binaryData);
	        return string;
	    }

	    public String encryptWithBase64(String string) throws Exception {
	        //  http://commons.apache.org/proper/commons-codec/ : org.apache.commons.codec.binary.Base64
	        // sun.misc.BASE64Encoder
	        byte[] binaryData = encrypt(getPublicKey(), string.getBytes());
	        String base64String = new BASE64Encoder().encodeBuffer(binaryData) /* org.apache.commons.codec.binary.Base64.encodeBase64(binaryData) */;
	        return base64String;
	    }



	    // convenient properties
	    public static RSAEncryptor sharedInstance = null;
	    public static void setSharedInstance (RSAEncryptor rsaEncryptor) {
	        sharedInstance = rsaEncryptor;
	    }




	    // From: http://blog.csdn.net/chaijunkun/article/details/7275632

	    /** 
	     * 私钥 
	     */  
	    private RSAPrivateKey privateKey;

	    /** 
	     * 公钥 
	     */  
	    private RSAPublicKey publicKey;

	    /** 
	     * 获取私钥 
	     * @return 当前的私钥对象 
	     */  
	    public RSAPrivateKey getPrivateKey() {
	        return privateKey;  
	    }  

	    /** 
	     * 获取公钥 
	     * @return 当前的公钥对象 
	     */  
	    public RSAPublicKey getPublicKey() {
	        return publicKey;  
	    }  

	    /** 
	     * 随机生成密钥对 
	     */  
	    public void genKeyPair(){  
	        KeyPairGenerator keyPairGen= null;
	        try {  
	            keyPairGen= KeyPairGenerator.getInstance("RSA");
	        } catch (NoSuchAlgorithmException e) {
	            e.printStackTrace();  
	        }  
	        keyPairGen.initialize(1024, new SecureRandom());
	        KeyPair keyPair= keyPairGen.generateKeyPair();
	        this.privateKey= (RSAPrivateKey) keyPair.getPrivate();
	        this.publicKey= (RSAPublicKey) keyPair.getPublic();
	    }  

	    /** 
	     * 从文件中输入流中加载公钥 
	     * @param in 公钥输入流 
	     * @throws Exception 加载公钥时产生的异常
	     */  
	    public void loadPublicKey(InputStream in) throws Exception {
	        try {  
	            BufferedReader br= new BufferedReader(new InputStreamReader(in));
	            String readLine= null;
	            StringBuilder sb= new StringBuilder();
	            while((readLine= br.readLine())!=null){  
	                if(readLine.charAt(0)=='-'){  
	                    continue;  
	                }else{  
	                    sb.append(readLine);  
	                    sb.append('\r');  
	                }  
	            }  
	            loadPublicKey(sb.toString());  
	        } catch (IOException e) {
	            throw new Exception("公钥数据流读取错误");
	        } catch (NullPointerException e) {
	            throw new Exception("公钥输入流为空");
	        }  
	    }  

	    /** 
	     * 从字符串中加载公钥 
	     * @param publicKeyStr 公钥数据字符串 
	     * @throws Exception 加载公钥时产生的异常
	     */  
	    public void loadPublicKey(String publicKeyStr) throws Exception {
	        try {  
	            BASE64Decoder base64Decoder= new BASE64Decoder();  
	            byte[] buffer= base64Decoder.decodeBuffer(publicKeyStr);
	            KeyFactory keyFactory= KeyFactory.getInstance("RSA");
	            X509EncodedKeySpec keySpec= new X509EncodedKeySpec(buffer);
	            this.publicKey= (RSAPublicKey) keyFactory.generatePublic(keySpec);
	        } catch (NoSuchAlgorithmException e) {
	            throw new Exception("无此算法");
	        } catch (InvalidKeySpecException e) {
	            throw new Exception("公钥非法");
	        } catch (IOException e) {
	            throw new Exception("公钥数据内容读取错误");
	        } catch (NullPointerException e) {
	            throw new Exception("公钥数据为空");
	        }  
	    }  

	    /** 
	     * 从文件中加载私钥 
	     * @param keyFileName 私钥文件名 
	     * @return 是否成功 
	     * @throws Exception
	     */  
	    public void loadPrivateKey(InputStream in) throws Exception {
	        try {  
	            BufferedReader br= new BufferedReader(new InputStreamReader(in));
	            String readLine= null;
	            StringBuilder sb= new StringBuilder();
	            while((readLine= br.readLine())!=null){  
	                if(readLine.charAt(0)=='-'){  
	                    continue;  
	                }else{  
	                    sb.append(readLine);  
	                    sb.append('\r');  
	                }  
	            }  
	            loadPrivateKey(sb.toString());  
	        } catch (IOException e) {
	            throw new Exception("私钥数据读取错误");
	        } catch (NullPointerException e) {
	            throw new Exception("私钥输入流为空");
	        }  
	    }  

	    public void loadPrivateKey(String privateKeyStr) throws Exception {
	        try {  
	            BASE64Decoder base64Decoder= new BASE64Decoder();  
	            byte[] buffer= base64Decoder.decodeBuffer(privateKeyStr);  
	            PKCS8EncodedKeySpec keySpec= new PKCS8EncodedKeySpec(buffer);
	            KeyFactory keyFactory= KeyFactory.getInstance("RSA");
	            this.privateKey= (RSAPrivateKey) keyFactory.generatePrivate(keySpec);
	        } catch (NoSuchAlgorithmException e) {
	            throw new Exception("无此算法");
	        } catch (InvalidKeySpecException e) {
	            e.printStackTrace();
	            throw new Exception("私钥非法");
	        } catch (IOException e) {
	            throw new Exception("私钥数据内容读取错误");
	        } catch (NullPointerException e) {
	            throw new Exception("私钥数据为空");
	        }  
	    }  

	    /** 
	     * 加密过程 
	     * @param publicKey 公钥 
	     * @param plainTextData 明文数据 
	     * @return 
	     * @throws Exception 加密过程中的异常信息
	     */  
	    public byte[] encrypt(RSAPublicKey publicKey, byte[] plainTextData) throws Exception {
	        if(publicKey== null){  
	            throw new Exception("加密公钥为空, 请设置");
	        }  
	        Cipher cipher= null;
	        try {  
	         	cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");//, new BouncyCastleProvider());
	            //cipher= Cipher.getInstance("RSA");//, new BouncyCastleProvider());  
	            cipher.init(Cipher.ENCRYPT_MODE, publicKey);
	            byte[] output= cipher.doFinal(plainTextData);  
	            return output;  
	        } catch (NoSuchAlgorithmException e) {
	            throw new Exception("无此加密算法");
	        } catch (NoSuchPaddingException e) {
	            e.printStackTrace();  
	            return null;  
	        }catch (InvalidKeyException e) {
	            throw new Exception("加密公钥非法,请检查");
	        } catch (IllegalBlockSizeException e) {
	            throw new Exception("明文长度非法");
	        } catch (BadPaddingException e) {
	            throw new Exception("明文数据已损坏");
	        }  
	    }  

	    /** 
	     * 解密过程 
	     * @param privateKey 私钥 
	     * @param cipherData 密文数据 
	     * @return 明文 
	     * @throws Exception 解密过程中的异常信息
	     */  
	    public byte[] decrypt(RSAPrivateKey privateKey, byte[] cipherData) throws Exception {
	        if (privateKey== null){  
	            throw new Exception("解密私钥为空, 请设置");
	        }  
	        Cipher cipher= null;
	        try {  
	         	cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");//, new BouncyCastleProvider());
	            //cipher= Cipher.getInstance("RSA");//, new BouncyCastleProvider());  
	            cipher.init(Cipher.DECRYPT_MODE, privateKey);
	            byte[] output= cipher.doFinal(cipherData);  
	            return output;  
	        } catch (NoSuchAlgorithmException e) {
	            throw new Exception("无此解密算法");
	        } catch (NoSuchPaddingException e) {
	            e.printStackTrace();  
	            return null;  
	        }catch (InvalidKeyException e) {
	            throw new Exception("解密私钥非法,请检查");
	        } catch (IllegalBlockSizeException e) {
	            throw new Exception("密文长度非法");
	        } catch (BadPaddingException e) {
	            throw new Exception("密文数据已损坏");
	        }         
	    }  



	    /** 
	     * 字节数据转字符串专用集合 
	     */  
	    private static final char[] HEX_CHAR= {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'}; 

	    /** 
	     * 字节数据转十六进制字符串 
	     * @param data 输入数据 
	     * @return 十六进制内容 
	     */  
	    public static String byteArrayToString(byte[] data){
	        StringBuilder stringBuilder= new StringBuilder();
	        for (int i=0; i<data.length; i++){  
	            //取出字节的高四位 作为索引得到相应的十六进制标识符 注意无符号右移  
	            stringBuilder.append(HEX_CHAR[(data[i] & 0xf0)>>> 4]);  
	            //取出字节的低四位 作为索引得到相应的十六进制标识符  
	            stringBuilder.append(HEX_CHAR[(data[i] & 0x0f)]);  
	            if (i<data.length-1){  
	                stringBuilder.append(' ');  
	            }  
	        }  
	        return stringBuilder.toString();  
	    }  
	    
	    
	    

	    public static String androidDecryt(String result) {
	    	String publicKeyFilePath = "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQC1Th3iuoro0U32ta6gQvOZ2rZmgr3Hi3vNCxUtnLA/BTdEi2NEM52zR2EQXG9soRC+9YiW0FbNR5lNqQcXDtC4EuznGBCMwg/FumamalyzRb/w2cpmkh2xuWslHwTk0JLJi9UFm6WRURK+no/1bMT1ppRFsSdq14a5hZ59yGQNJwIDAQAB";
			String privateKeyFilePath = "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";
			try {
			RSAEncryptor rsa = new RSAEncryptor(privateKeyFilePath,publicKeyFilePath);
	
				String cardno = rsa.decryptWithBase64(result);
				return cardno;
			} catch (Exception e) {
				e.printStackTrace();
			}
			
			return null;
	    }

}

